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Ink composition for inkjet recording

a technology of inkjet recording and composition, applied in the direction of inks, coatings, powdery paints, etc., can solve the problems of low storage stability of known pigment dispersion, insufficient printing quality, and insufficient fixing properties, etc., to achieve excellent discharge stability of ink, stable and stable, and color-developing properties. excellent

Inactive Publication Date: 2010-09-09
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016]However, the known ink is insufficient in printing quality and is, in particular, as an inkjet recording ink for textile, insufficient in fixing property and also in color concentration and color-developing property. In addition, the known pigment dispersion is low in storage stability and therefore instable, and, in the presence of a material having a hydrophilic moiety and a hydrophobic moiety, such as a surfactant or a glycol ether, a polymer easily attaches to or detaches from the pigment. Thus, there has been a problem that the storage stability of the ink is inferior. In a common aqueous ink, a material having a hydrophilic moiety and a hydrophobic moiety, such as a surfactant or a glycol ether, is essential in order to reduce bleeding to paper. An ink not containing such a material is insufficient in penetrating ability to paper and, thereby, has problems that the type of paper is restricted for performing uniform printing and that a reduction in a printed image easily occurs.
[0018]Accordingly, the invention solves such problems, and it is an object thereof to provide an inkjet recording ink that is excellent in color-developing property, stability, and fixing property and is excellent, in particular, as an inkjet recording ink for textile, and is also excellent in discharge stability of the ink from an inkjet head.

Problems solved by technology

However, the known ink is insufficient in printing quality and is, in particular, as an inkjet recording ink for textile, insufficient in fixing property and also in color concentration and color-developing property.
In addition, the known pigment dispersion is low in storage stability and therefore instable, and, in the presence of a material having a hydrophilic moiety and a hydrophobic moiety, such as a surfactant or a glycol ether, a polymer easily attaches to or detaches from the pigment.
Thus, there has been a problem that the storage stability of the ink is inferior.
An ink not containing such a material is insufficient in penetrating ability to paper and, thereby, has problems that the type of paper is restricted for performing uniform printing and that a reduction in a printed image easily occurs.
Furthermore, if a known dispersion contains an additive (an acetylene glycol-based or acetylene alcohol-based surfactant, di(tri)ethylene glycol monobutyl ether, (di)propylene glycol monobutyl ether, 1,2-alkylene glycol, or a mixture thereof) that is used in the invention, long storage stability is not obtained, and redissolvability of the ink is poor.
Therefore, the ink has a problem to easily cause clogging in, for example, the tip of a nozzle of an inkjet head by being dried.

Method used

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Examples

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examples

[0043]The invention will be more specifically described below. As Examples, cases in which pigments are dispersed with most preferable polymers will be shown, but the invention is not limited to these Examples only. In what follows, the term “part(s)” means “part(s) by weight”, and the term “%” means “% by weight”.

[0044]Examples of the ink of the first embodiment of the invention will be described below.

example a1

(1) Production of Pigment Dispersion A1

[0045]In pigment dispersion A1, pigment blue 15:3 (copper phthalocyanine pigment: manufactured by Clariant) was used. A reaction vessel equipped with a stirrer, a thermometer, a reflux tube, and a dropping funnel was substituted by nitrogen, and then 75 parts of benzyl acrylate, 2 parts of acrylic acid, and 0.3 parts of t-dodecyl mercaptan were put in the vessel, followed by heating to 70° C. Separately prepared 150 parts of benzyl acrylate, 15 parts of acrylic acid, 5 parts of butyl acrylate, 1 part of t-dodecyl mercaptan, 20 parts of methyl ethyl ketone, and 1 part of sodium persulfate were dropwise added to the reaction vessel through the dropping funnel over 4 hours, thereby polymerizing a dispersion polymer. Then, methyl ethyl ketone was added to the reaction vessel to produce a solution of dispersion polymer having a concentration of 40%. The dispersion polymer had a molecular weight, in terms of styrene, of 100000, when measured by gel p...

example a2

(1) Production of Pigment Dispersion A2

[0051]First, pigment dispersion A2 was produced as in the pigment dispersion A1 using pigment violet 19 (quinacridone pigment: manufactured by Clariant) to give the pigment dispersion A2. The particle size measured by the same method as in Example A1 was 90 nm.

(2) Production of Fluorine Resin Particle Dispersion A1

[0052]The same fluorine resin particle dispersion A1 as in Example A1 was used.

(3) Preparation of Inkjet Recording Ink

[0053]An ink was produced and evaluated as in Example A1 by mixing the pigment dispersion A2 produced by the above-described process with the vehicle components shown in Table 2.

(4) Abrasion Resistance Test and Dry-Cleaning Test

[0054]The abrasion resistance test and the dry-cleaning test were carried out using the ink of Example A2 by the same method and the same evaluation method as in Example A1. Table 1 shows the results of the abrasion resistance test and the dry-cleaning test.

(5) Measurement of Discharge Stability...

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Abstract

It is an object of the invention to provide an inkjet recording ink that is excellent in color-developing property, stability, and fixing property and is excellent, in particular, as an inkjet recording ink for textile.The inkjet recording ink according to the invention contains a pigment dispersion that enables a pigment to be dispersed in water by using a polymer in which 50% by weight or more of benzyl acrylate and 15% by weight or less of methacrylic acid and / or acrylic acid are polymerized as constituents and that has an average particle size of 50 nm or more and 300 nm or less; polymer microparticles having a glass transition temperature of 0° C. or less and an acid number of 100 mg KOH / g or less; and fluorine resin particles having an average particle size of 400 nm or less.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS[0001]The entire disclosure of Japanese Patent Application No. 2009-011682, filed on Jan. 22, 2009, No. 2009-011683, filed on Jan. 22, 2009, No. 2010-000447, filed on Jan. 5, 2010, and No. 2010-000448, filed on Jan. 5, 2010 are expressly incorporated by reference herein.FIELD OF THE INVENTION[0002]The present invention relates to an inkjet recording ink that is excellent in color-developing property, stability, and fixing property and is excellent, in particular, as an inkjet recording ink for textile.BACKGROUND OF THE INVENTION[0003]Characteristics required in an ink used for inkjet recording are that, for example, no bleeding occurs in printing on paper serving as a recording medium, drying is rapid, uniform printing on surfaces of various recording media is possible, and mixing between adjacent colors does not occur in polychromatic printing such as color printing.[0004]In known inks, particularly, in many of pigment-based inks, the securin...

Claims

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Application Information

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IPC IPC(8): C08K7/00
CPCC09D11/326
Inventor NAGASE, MAKOTOYATAKE, MASAHIRO
Owner SEIKO EPSON CORP